20839439 has 8 divisors (see below), whose sum is σ = 21591360. Its totient is φ = 20099200.

The previous prime is 20839417. The next prime is 20839451. The reversal of 20839439 is 93493802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20839439 - 2¹⁶ = 20773903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20839459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794 + ... + 6504.

It is an arithmetic number, because the mean of its divisors is an integer number (2698920).

Almost surely, 2^20839439 is an apocalyptic number.

20839439 is a deficient number, since it is larger than the sum of its proper divisors (751921).

20839439 is an equidigital number, since it uses as much as digits as its factorization.

20839439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5841.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 20839439 is about 4565.0234391512. The cubic root of 20839439 is about 275.1874820718.

The spelling of 20839439 in words is "twenty million, eight hundred thirty-nine thousand, four hundred thirty-nine".